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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I did the same. I guess it's a remnants of numerous attempts to return string. A bit later, when I realise that solution requires list, I've changed return string to list, however convertion of two parts remained.